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Iron deficiency anemia  causing blue skin under the eyes. If there is a shortage of iron in the body, oxygen cannot be properly transported by the blood. Hemoglobin is the oxygen transporting component in the blood, moving oxygen from the lungs to the cells where it is released for normal cell metabolism.
What causes blue sclera? Quick Answer. Blue sclera, or a blue tint to the white's of a patient's eyes, can be caused by the disease osteogenesis imperfecta, according to Medline Plus. Osteogenesis imperfect is a congenital disease that is most commonly caused by a defect in the gene that codes for type 1 collagen.